package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        //shoppingCartDTO里有dishId setmealId和dishFlavor，
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//      //每个商品在购物车中应该是唯一的，只是数量可能不是一
//      if (list != null && list.size() == 1) {
        if (list != null && list.size() > 0) {
            //如果已经存在，则增加数量，不会再插入一条数据
            ShoppingCart cart = list.get(0);//取出唯一一条数据即可
            cart.setNumber(cart.getNumber() + 1);//update shopping_cart set number = number + 1 where id = ?
            shoppingCartMapper.updateNumberById(cart);


        } else {
            //如果不存在，则添加到购物车中

            //判断添加到购物车的是套餐还是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //添加到购物车的是套餐
                Long setmealId =shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder().
                userId(currentId).
                build();

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     * @return
     */
    @Override
    public void cleanShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.daleteByUserId(currentId);
        //当前登录用户的id不需要作为参数传过来，因为请求头token中已经封装了当前登录用户的id
        //（在拦截器JwtTokenUserInterceptor里解析了，
        // BaseContext.setCurrentId(userId)保存了）
//        ShoppingCart shoppingCart = ShoppingCart.builder().
//                userId(currentId).
//                build();
//        shoppingCartMapper.deleteByUserId(shoppingCart);
    }
}
